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We see the red / brown copper metal start to appear in place of the grey iron, and the solution changes colour from blue to green, as copper sulphate is blue but iron sulphate is green. We see the red / brown copper metal start to appear in place of the grey iron, and the solution changes colour from blue to green, as copper sulphate is blue but iron sulphate is green.

We see the red / brown copper metal start to appear in place of the grey iron, and the solution changes colour from blue to green, as copper sulphate is blue but iron sulphate is green. We see the red / brown copper metal start to appear in place of the grey iron, and the solution changes colour from blue to green, as copper sulphate is blue but iron sulphate is green.

Reactions2010

3.
Objectives <ul><li>Identify parts of a chemical equation </li></ul><ul><li>Recognize four types of chemical reactions </li></ul><ul><li>Describe Law of Conservation of Mass </li></ul>

4.
Molecules and Compounds Some elements exist as individual atoms. Molecules consist of two or more elements joined together. If more than one type of atom is in a molecule, we call it a compound .

5.
Chemical Reactions Chemical reactions happen when the atoms in one or more molecules split up and join together in new ways. For example, hydrogen can react with oxygen :

6.
<ul><li>When a reaction takes place, things happen. There may be a gas given off, a color change or a solid material appearing. There could also be changes we can’t see, such as a temperature change. </li></ul><ul><li>The mass of the reactants (the chemicals we start with) is always the same as the mass of the products (the chemicals we end with). </li></ul>Law of Conservation of Mass

8.
Chemical Equations <ul><li>On the left are the reactants – the starting materials </li></ul><ul><li>On the right are the products – the new substances that are formed </li></ul><ul><li>An arrow connects the two sides – read as yields or produces </li></ul>AgNO 3 + NaCl  AgCl + NaNO 3 Read left to right like a sentence in chemical terms